configure fails to detect dirfd on FreeBSD because it is a macro ...

[Richard Sharpe]

Hi folks,

On FreeBSD, dirfd is not detected by configure:

configure:25451: checking for dirfd
configure:25507: gcc -o conftest -O0
-I/home/rsharpe/dev-src/buildroot/tools/x86_gcc4.2.4/usr/include
-DPANZURA_DEV -I/home/rsharpe/dev-src/buildroot/../pixel8/replock
-I/home/rsharpe/dev-src/buildroot/build/cloudcc/build_x86_64/samba-3.6.6/lib/tdb/include
-I/home/rsharpe/dev-src/buildroot/build/cloudcc/build_x86_64/root/usr/include
-Iinclude -I./include  -I. -I. -I./../lib/replace -I./../lib/tevent
-I./librpc -I./.. -I./../lib/popt --sysroot
/home/rsharpe/dev-src/buildroot/tools/x86_gcc4.2.4
-L/home/rsharpe/dev-src/buildroot/tools/x86_gcc4.2.4/lib
-L/home/rsharpe/dev-src/buildroot/tools/x86_gcc4.2.4/usr/lib
-L/home/rsharpe/dev-src/buildroot/build/cloudcc/build_x86_64/samba-3.6.6/source3
-L/home/rsharpe/dev-src/buildroot/build/cloudcc/build_x86_64/samba-3.6.6/source3/bin
-L/home/rsharpe/dev-src/buildroot/build/cloudcc/build_x86_64/licd/build/FreeBSD/export/dist/lib
-rpath /home/rsharpe/dev-src/buildroot/tools/x86_gcc4.2.4/lib -rpath
/home/rsharpe/dev-src/buildroot/tools/x86_gcc4.2.4/usr/lib conftest.c
 >&5
/var/tmp//ccQXACBM.o(.text+0xa): In function `main':
: undefined reference to `dirfd'

This is because it is a macro. The code used is:

|
| int
| main ()
| {
| return dirfd ();
|   ;
|   return 0;
| }

That won't match the dirfd macro.

Does anyone know a quick alternative test for dirfd as a macro?

-- 
Regards,
Richard Sharpe
(何以解憂？唯有杜康。--曹操)